JP2012134549A - Power supply device and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device preventing a continued arc.SOLUTION: A power supply device and a lighting device include: a DC circuit outputting a direct current for a connected light source; and a control section that detects an arc, and reduces or stops the direct current at the time when the arc is detected.

Description

  The present invention relates to a power supply device that outputs a direct current to a light source and an illumination device including the same.

  2. Description of the Related Art Conventionally, for example, there is an illumination device equipped with an LED module that is a light emitting module in which a plurality of light emitting diodes (LEDs) are connected in series as a light source. In such an illuminating device, in order to light the LEDs of each light emitting module substantially uniformly, a constant current is supplied to the light emitting module using a power source as a constant current power source (see, for example, Patent Document 1). .

JP 2007-96287 A (page 6-7, FIG. 1-2)

  However, in the above-described power supply device, when an arc occurs in the circuit due to attachment / detachment of each connection portion in the circuit, contact failure, disconnection, or opening of LED wire bonding, a direct current is supplied to the circuit. Therefore, there is a problem that this arc cannot be extinguished.

  This invention is made | formed in view of such a point, and it aims at providing the power supply device which prevented the continuation of the arc, and an illuminating device provided with the same.

  A power supply apparatus according to claim 1; a DC circuit that outputs a DC current to a connected light source;

  A controller for detecting an arc and reducing or stopping the direct current when the arc is detected.

  Each light source is preferably, for example, an LED, but is not limited to an LED.

  For example, a constant current power source or a constant voltage power source is used as the DC circuit.

  The power supply device according to claim 2 is the power supply device according to claim 1, wherein the DC circuit is a constant current circuit, and the control unit detects an arc when the output voltage of the constant current circuit increases. .

  For example, the control unit detects whether or not the output voltage exceeds a preset threshold voltage, and controls the DC current of the constant current circuit as a DC circuit in response to the detection.

  The power supply device according to claim 3 is the power supply device according to claim 1, wherein the direct current circuit is a constant voltage circuit, and the control unit detects an arc by a decrease in direct current output from the constant voltage circuit. Features.

  The control unit detects, for example, a decrease in direct current based on a voltage variation caused by the resistance, and controls the direct current of a constant current circuit as a direct current circuit in accordance with the detection.

  According to a fourth aspect of the present invention, there is provided a lighting apparatus comprising: the power supply apparatus according to any one of the first to third aspects; and a light source that emits light when supplied with a direct current from a constant current circuit of the power supply apparatus.

  A lighting device according to a fifth aspect of the present invention includes a power source device according to any one of the first to fourth aspects; a light source that emits light when supplied with a direct current from a constant current circuit of the power source device; And a module.

  The lighting device according to claim 6 includes a light emitting module including a light source and a detection unit that detects an arc based on a change in voltage of the light source and outputs a signal in response to the detection; the light emitting module is connectable; And a constant current power source that supplies a constant output current and varies the output current in accordance with a signal output from the detection unit.

  The light emitting module is configured, for example, as a unit that connects a plurality of light sources such as LEDs in series and is detachable from a constant current power source.

  The detection unit switches the output signal by detecting whether the voltage of the light source exceeds a preset threshold voltage, for example.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply device which prevented the continuation of the arc, and an illuminating device provided with the same can be provided.

It is a circuit diagram of the illuminating device provided with the power supply device which shows the 1st Embodiment of this invention. It is a timing chart which shows the control signal of the control part of a power supply device same as the above. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 2nd Embodiment of this invention. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 3rd Embodiment of this invention. It is a timing chart which shows the control signal of the control part of a power supply device same as the above. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 4th Embodiment of this invention. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 5th Embodiment of this invention. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 6th Embodiment of this invention. It is a circuit diagram of the illuminating device provided with the power supply device which shows the 7th Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 show a first embodiment, FIG. 1 is a circuit diagram of a lighting device provided with a power supply device, and FIG. 2 is a timing chart showing control signals of a control unit of the power supply device.

  As shown in FIG. 1, the LED lighting device 11 as a lighting device has a commercial AC power source e connected to the primary side of a power transformer PT via a diode bridge DB as a rectifier, and a smoothing electrolytic capacitor 12 is provided. In addition to being connected, a MOSFET 13 which is a semiconductor switch as a switching element for output control is connected, and a primary side control unit 14 for controlling the switching operation of the MOSFET 13 is connected to the base of the MOSFET 13.

  Further, on the secondary side of the power transformer PT, a constant voltage circuit 19 which is a DC circuit is connected by connecting a series circuit of a diode 15, a resistor 16, and a light emitting module 18 having a plurality of LEDs 17 as a light source in series. In addition, a smoothing electrolytic capacitor 21 is connected in parallel with the resistor 16 and the LED 17 to the cathode side of the diode 15.

  Further, a MOSFET 23 that is a semiconductor switch as a bypass switching element is connected in parallel to the resistor 16, and a PWM control unit 24 as a control unit body for controlling the MOSFET 23 is connected to the gate of the MOSFET 23. It is connected. The MOSFET 23 and the PWM control unit 24 constitute a control unit 25 that is a secondary side control unit that controls the direct current output from the constant voltage circuit 19, and each unit except the light emitting module 18 A power supply device 26 for an illumination device such as the LED lighting device 11 is configured.

  The MOSFET 23 is, for example, a depletion type single-gate n-channel, and a resistor 16 is connected between the source and the drain.

  The PWM control unit 24 is a microcomputer, for example, and performs PWM control of the MOSFET 23 by outputting a PWM control signal P, which is a predetermined control signal, to the gate of the MOSFET 23. Here, as shown in FIG. 2, the PWM control signal P has a predetermined duty ratio periodically having a constant on-period T1 and an off-period T2 which is a short output reduction period after the on-period T1. It is a pulse signal.

  Here, the off period T2 is set to a time sufficient to extinguish the arc. In the off period T2, the PWM control signal P indicates that the current value flowing through the constant voltage circuit 19 is a current value at which the arc can be extinguished, for example, the LED 17 is not lit or becomes darker than the normal lit state. A voltage having a magnitude for setting the operation of the MOSFET 23 to be a value can be supplied to the MOSFET 23. Further, the off period T2 is set to a time during which the LED 17 is not turned off or the dark light emission state is not recognized in terms of viewing angle. For this reason, the on period T1 and the off period T2 are performed in such a cycle that the switching of the lighting state of the LED 17 by switching cannot be recognized with the naked eye.

  Next, the operation of the first embodiment will be described.

  The voltage output from the commercial AC power source e is rectified by the diode bridge DB and smoothed by the electrolytic capacitor 12, and then boosted by the power transformer PT. The boosted voltage causes the constant voltage circuit 19 to load, Here, a direct current corresponding to the resistance value of the resistor 16 flows.

  At this time, in the ON period T1 of the PWM control signal P, the MOSFET 23 is turned off by the PWM control signal P supplied to the gate of the MOSFET 23, and the direct current set by the resistor 16 flows to the constant voltage circuit 19, whereby the LED 17 Lights up.

  In the off period T2 of the PWM control signal P, the PWM control signal P supplied to the gate of the MOSFET 23 turns on the MOSFET 23 to enter a predetermined energized state, thereby bypassing the resistor 16 by the MOSFET 23, and the constant voltage circuit. The direct current flowing through 19 is suppressed, and the LED 17 is turned off.

  Since the off period T2 is sufficiently shorter than the on period T1, even if the above-described lighting / extinguishing operation is repeated, it seems to the observer that the LED 17 is maintained in the lighting state.

  Even when an arc is generated in the constant voltage circuit 19 due to attachment / detachment of each connection portion in the constant voltage circuit 19, contact failure, disconnection, or opening of wire bonding of the LED 17, the arc is extinguished during the output of the direct current. Since the arcable off-period T2 is formed, the continuation of the arc can be prevented by reducing the direct current during the off-period T2.

  Next, FIG. 3 shows a second embodiment, and FIG. 3 is a circuit diagram of an illumination device provided with a power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, a constant current power supply 27 is connected to the diode bridge DB in the first embodiment, and the light emitting module 18 is connected to the constant current power supply 27 and is a DC circuit. The constant current circuit 29 is configured.

  Further, on the output side of the constant current power supply 27, a series circuit of a resistor 31 and a MOSFET 23 is connected in parallel to the light emitting module 18, and a PWM control unit 24 is connected to the base of the MOSFET 23. The MOSFET 23 and the PWM control unit 24 constitute a control unit 34 that controls the current flowing through the constant current circuit 29.

  When a constant direct current is output from the constant current power supply 27 to the constant current circuit 29, the MOSFET 23 is turned off by the PWM control signal P supplied to the gate of the MOSFET 23 in the on period T1 of the PWM control signal P. Since no current flows to the resistor 31 side and all the direct current output from the constant current power supply 27 flows to the light emitting module 18 side, the LED 17 is turned on.

  Further, during the off period T2 of the PWM control signal P, the MOSFET 23 is turned on by the PWM control signal P supplied to the gate of the MOSFET 23 to be in a predetermined energized state, so that a part of the direct current is bypassed to the resistor 31 side. Thus, the direct current flowing to the light emitting module 18 side is suppressed, and the LED 17 is turned off.

  Since the off period T2 is sufficiently shorter than the on period T1, even if the above-described lighting / extinguishing operation is repeated, it seems to the observer that the LED 17 is maintained in the lighting state.

  Even when an arc is generated in the constant current circuit 29 due to attachment / detachment of each connection portion in the constant current circuit 29, contact failure, disconnection, or opening of wire bonding of the LED 17, an off period T2 during the output of the direct current Since the direct current is reduced during the off period T2, the continuation of the arc can be prevented.

  Next, FIG. 4 and FIG. 5 show a third embodiment, FIG. 4 is a circuit diagram of an illumination device provided with a power supply device, and FIG. 5 is a timing chart showing control signals of a control unit of the power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 4, the resistor 16 of the constant voltage circuit 19 is not provided, and the switching element is connected to the cathode side of the diode 15 and the light emitting module 18 in the first embodiment. The source and drain of a MOSFET 36 that is a semiconductor switch are connected.

  The MOSFET 36 is, for example, an enhancement type single gate n-channel, and a PWM control unit 37 as a control unit main body is connected to the base. The MOSFET 36 and the PWM control unit 37 constitute a control unit 38 that controls the direct current flowing through the constant voltage circuit 19.

  As shown in FIG. 5, the PWM control unit 37 has a predetermined duty in which the PWM control signal P periodically has a certain on period T1 and an off period T3 that is a short output stop period after the on period T1. The ratio pulse signal.

  Here, the off period T3 is set to a time sufficient to extinguish the arc. In the off period T2, the PWM control signal P has an output of 0 so as to stop the operation of the MOSFET 36. Further, the ON period T1 and the OFF period T3 are performed in a cycle that the switching of the lighting state of the LED 17 by switching cannot be recognized with the naked eye.

  Therefore, the voltage output from the commercial AC power source e is rectified by the diode bridge DB and smoothed by the electrolytic capacitor 12, and then boosted by the power transformer PT. The boosted voltage causes the constant voltage circuit 19 to A direct current according to the load flows.

  At this time, in the on period T1 of the PWM control signal P, the MOSFET 36 is turned on by the PWM control signal P supplied to the gate of the MOSFET 36, and the direct current flows through the constant voltage circuit 19, whereby the LED 17 is lit.

  In the off period T2 of the PWM control signal P, the MOSFET 36 is turned off by the PWM control signal P supplied to the gate of the MOSFET 36, so that the direct current flowing in the constant voltage circuit 19 is stopped and the LED 17 is turned off. .

  Since the off period T2 is sufficiently shorter than the on period T1, even if the above-described lighting / extinguishing operation is repeated, it seems to the observer that the LED 17 is maintained in the lighting state.

  Further, even when an arc is generated in the constant voltage circuit 19 due to attachment / detachment of each connection portion in the constant voltage circuit 19, contact failure, disconnection or opening of wire bonding of the LED 17, the off period T2 during the output of the direct current Since the direct current is reduced during the off period T2, the continuation of the arc can be prevented.

  Next, FIG. 6 shows a fourth embodiment, and FIG. 6 is a circuit diagram of an illumination device provided with a power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fourth embodiment, the resistor 31 is removed and the source side of the MOSFET 23 is connected to the output side of the constant current power supply 27 in the second embodiment.

  Further, a PWM control unit 37 is connected to the base of the MOSFET 23, and the control unit 39 that controls the direct current output from the constant current circuit 29 is configured by the MOSFET 23 and the PWM control unit 37.

  When a constant direct current is output from the constant current power supply 27 to the constant current circuit 29, the MOSFET 23 is turned off by the PWM control signal P supplied to the gate of the MOSFET 23 in the on period T1 of the PWM control signal P. Since no current flows to the resistor 31 side and all the direct current output from the constant current power supply 27 flows to the light emitting module 18 side, the LED 17 is turned on.

  Further, in the off period T2 of the PWM control signal P, the MOSFET 23 is turned on by the PWM control signal P supplied to the gate of the MOSFET 23 to be in a predetermined energized state, whereby a direct current is bypassed to the MOSFET 23 side, and the light emitting module The direct current flowing on the 18 side is stopped, and the LED 17 is turned off.

  Since the off period T2 is sufficiently shorter than the on period T1, even if the above-described lighting / extinguishing operation is repeated, it seems to the observer that the LED 17 is maintained in the lighting state.

  Even when an arc is generated in the constant current circuit 29 due to attachment / detachment of each connection portion in the constant current circuit 29, contact failure, disconnection, or opening of wire bonding of the LED 17, an off period T2 during the output of the direct current Since the direct current is reduced during the off period T2, the continuation of the arc can be prevented.

  Next, FIG. 7 shows a fifth embodiment, and FIG. 7 is a circuit diagram of a lighting device provided with a power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fifth embodiment, in place of the MOSFET 13 in the first embodiment, a MOSFET 41 as a semiconductor switch as a switching element is connected to the primary side of the power transformer PT. A primary side control unit 43 is connected to the gate via a resistor 42.

  Further, the primary side control unit 43 is supplied with power from a DC power supply 45, and the output side of the DC power supply 45 is in parallel with the primary side control unit 43 and a photocoupler 47 which is a detection voltage transmission means via a resistor 46. Is connected to the transistor 48 on the output side.

  Further, an inductor L for removing high frequency is connected between the commercial AC power source e and the diode bridge DB.

  The primary side control unit 43 controls the switching operation of the MOSFET 41 by, for example, outputting a pulse signal or the like to the base of the MOSFET 41, and the primary side current is controlled by this control.

  The transistor 48 is, for example, an NPN phototransistor, a resistor 46 is connected to the collector side, and the emitter side is grounded.

  On the other hand, in the constant voltage circuit 19 which is the secondary side of the power transformer PT, a series circuit of voltage dividing resistors 51 and 52 as load voltage detecting means is in parallel with the electrolytic capacitor 21 and the light emitting module 18 on the cathode side of the diode 15. The position between the resistors 51 and 52 is connected to the plus side terminal of a comparator 53 which is a comparator as a determination means.

  Further, the negative side terminal of the comparator 53 is connected to the output side of a DC power supply 55 for setting a predetermined threshold voltage, and the output terminal of the comparator 53 is connected to a semiconductor switch as a switching element via a resistor 56. The base of a certain transistor 57 is connected. The transistor 57 is, for example, an NPN bipolar transistor, and has an emitter grounded and a collector connected to an LED 59 on the input side of the photocoupler 47 via a resistor 58.

  The comparator 53 compares the voltage between the voltage dividing resistors 51 and 52, which are positive terminals, with a predetermined threshold voltage set by the DC power supply 55, and turns off the transistor 57 when the threshold voltage is large. When the current is output to the base (L level output) and the voltage between the resistors 51 and 52 is large, the current for turning on the transistor 57 is output to the base (H level output). Therefore, the resistors 51, 52, the comparator 53, the DC power source 55, etc. constitute voltage detecting means for detecting the output voltage of the constant voltage circuit 19, and the voltage of the constant voltage circuit 19 detected by the voltage detecting means is used to The operation of the coupler 47 is controlled.

  The LED 59 supplies a signal to the base of the transistor 48 by light, the cathode side is connected to the collector side of the transistor 57, and the anode side is connected in parallel with the resistors 51 and 52 and the light emitting module 18 to the cathode side of the diode 15. Has been.

  The MOSFET 41, the primary side control unit 43, the photocoupler 47, the resistors 51 and 52, the comparator 53, the transistor 57, and the like constitute a control unit 60 that controls the direct current flowing through the constant voltage circuit 19.

  In the LED lighting device 11, the voltage output from the commercial AC power source e is rectified by the diode bridge DB and smoothed by the electrolytic capacitor 12. At this time, the primary side control unit 43 receives power from the DC power supply 45, supplies a predetermined voltage to the gate of the MOSFET 41, and controls the current on the primary side of the power transformer PT, so that the secondary side of the power transformer PT The direct current flowing through the constant voltage circuit 19 is controlled to a predetermined current value, and the LED 17 is lit by this direct current.

  Here, when the LED 17 is in a normal lighting state, since the voltage divided by the resistors 51 and 52 is lower than the threshold voltage set by the DC power supply 55, the comparator 53 outputs an L level, and the transistor 57 turns off, LED 59 does not light up, and photocoupler 47 does not operate.

  On the other hand, when an arc occurs in the constant voltage circuit 19 due to attachment / detachment of each connection part in the constant voltage circuit 19, contact failure, disconnection, or opening of wire bonding of the LED 17, the constant voltage circuit 19 outputs the arc. Since the voltage divided by the resistors 51 and 52 becomes higher than the threshold voltage set by the DC power supply 55, the voltage divided by the resistors 51 and 52 due to the decrease of the DC power supply is reduced. Is detected reliably, the comparator 53 outputs an H level, and the transistor 57 is turned on. As a result, a current flows through the LED 59, the LED 59 is lit, and the transistor 48 is turned on. That is, the photocoupler 47 operates.

  For this reason, a part of the current supplied from the DC power supply 45 flows to the resistor 46 side, and when the primary side control unit 43 detects a voltage drop due to the resistor 46, it is output from the primary side control unit 43 to the MOSFET 41. The control signal is suppressed or stopped, and the current flowing to the primary side of the power transformer PT is reduced or stopped, so that the direct current flowing through the constant voltage circuit 19 that is the secondary side of the power transformer PT is also reduced or stopped. Thus, the continuation of the arc can be prevented.

  Next, FIG. 8 shows a sixth embodiment, and FIG. 8 is a circuit diagram of an illumination device provided with a power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the sixth embodiment, a feeding electrolytic capacitor 63 is connected via a resistor 64 in place of the DC power supply 45 on the primary side of the power transformer PT in the fifth embodiment. .

  On the other hand, the constant voltage circuit 19 that is the secondary side of the power transformer PT has a series circuit of the light emitting module 18 and the resistor 66 connected to the cathode side of the diode 15, and is in parallel with the electrolytic capacitor 21 and the light emitting module 18. The resistor 67 is connected to the anode side of the LED 59 of the photocoupler 47.

  Further, the position between the light emitting module 18 and the resistor 66 is connected to the negative terminal of the comparator 71 which is a comparator as a determination means. The positive side terminal of the comparator 71 is connected to a DC power source 73 that sets a predetermined threshold voltage, and the output terminal is connected to the base of the transistor 57 via a resistor 56.

  The MOSFET 41, the primary side control unit 43, the photocoupler 47, the resistors 66 and 67, the comparator 71, the transistor 57, and the like constitute a control unit 75 that controls the direct current flowing through the constant voltage circuit 19.

  In the LED lighting device 11, the voltage output from the commercial AC power source e is rectified by the diode bridge DB and smoothed by the electrolytic capacitor 12. At this time, the primary side control unit 43 receives power from the DC power supply 45, supplies a predetermined voltage to the gate of the MOSFET 41, and controls the current on the primary side of the power transformer PT, so that the secondary side of the power transformer PT The direct current flowing through the constant voltage circuit 19 is controlled to a predetermined current value, and the LED 17 is lit by this direct current.

  Here, when the LED 17 is in a normal lighting state, since the voltage generated by the resistor 66 is higher than the threshold voltage set by the DC power source 73, the comparator 71 outputs L level and the transistor 57 is turned off. The LED 59 does not light up and the photocoupler 47 does not operate.

  On the other hand, if an arc occurs in the constant voltage circuit 19 due to attachment / detachment of each connection part in the constant voltage circuit 19, contact failure, disconnection, or opening of the wire bonding of the LED 17, etc., the direct current of the constant voltage circuit 19 Since the voltage generated by the resistor 66 is lower than the threshold voltage set by the DC power supply 73, the arc is reliably detected by the voltage drop generated by the resistor 66 due to the decrease of the DC power supply. When H level is output and the transistor 57 is turned on, a current flows through the LED 59, the LED 59 is lit, and the transistor 48 is turned on. That is, the photocoupler 47 operates.

  For this reason, the current supplied from the DC power supply 45 is bypassed through the transistor 48, so that the primary side control unit 43 stops and the current flowing to the primary side of the power supply transformer PT stops, thereby causing the power supply transformer PT The DC current flowing through the constant voltage circuit 19 which is the secondary side of the current is also stopped, and the arc can be prevented from continuing.

  In the seventh embodiment, the primary side control unit 43 is configured to reduce the direct current of the constant voltage circuit 19 by reducing the primary side current of the power transformer PT by detecting the arc. Also good.

  In each of the above embodiments, the light emitting module 18 may be a detachable unit, for example, and a plurality of the light emitting modules 18 may be connected in parallel.

  Next, FIG. 9 shows a seventh embodiment, and FIG. 9 is a circuit diagram of an illumination device provided with a power supply device. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the seventh embodiment, in the second embodiment, the constant current power supply 27 is provided so that the output current can be adjusted, and the light emitting module 81 as a unit is connected to the constant current power supply 27. Thus, the constant current circuit 29 is configured.

  The light emitting module 81 is a module board that can be attached and detached in parallel to the constant current power supply 27, and is used for voltage division as a series circuit of a plurality of LEDs 82 as a light source and a load voltage detecting means between main terminals 81a and 81b. A parallel circuit with a series circuit of the resistors 83 and 84 is connected, and a position between the resistors 83 and 84 is connected to a plus side terminal of a comparator 85 which is a comparator as a determination means.

  The negative terminal of the comparator 85 is connected to a DC power supply 87 for setting a predetermined threshold voltage, and the output terminal of the comparator 85 is connected to the abnormality detection terminal 81c of the light emitting module 81 via a resistor 88. The abnormality detection terminal 81c is connected to the constant current power source 27. Further, a DC power supply 89 is connected to the positive input terminal of the comparator 85 via the input terminal 81d of the light emitting module 81, and a negative side of the DC power supply 87 is connected to the negative input terminal. .

  The constant current power supply 27 is configured to be able to control the direct current output according to the signal voltage output from the abnormality detection terminal 81c.

  The constant current power supply 27, the resistors 83 and 84, the comparator 85, the DC power supply 87, and the like constitute a detection unit 90 that outputs a signal to the constant current power supply 27 according to the voltage of the LED 82.

  In the LED lighting device 11, the current flows through the LED 82 in each light emitting module 81 by the direct current output from the constant current power supply 27, so that the LED 82 is lit.

  Here, when the LED 82 is in a normal lighting state, the voltage of the LED 82 divided by the resistors 83 and 84 is lower than the threshold voltage set by the DC power supply 87, so the comparator 85 outputs an L level. The constant current power supply 27 supplies a normal direct current to the constant current circuit 29.

  On the other hand, when an arc is generated due to poor contact or disconnection in the light emitting module 81, the current flowing through the light emitting module 81 is reduced, so that the voltage of the LED 82 divided by the resistors 83 and 84 becomes the DC power supply 87. Therefore, the comparator 85 outputs an H level that is the voltage of the DC power supply 89.

  As a result, the voltage output from the abnormality detection terminal 81c of the light emitting module 81 rises according to the fluctuation of the voltage of the LED 82 due to the occurrence of the arc, so that the arc is reliably detected by this voltage rise, and the abnormality detection terminal Specifically, when the output signal voltage from the abnormality detection terminal 81c increases according to the signal voltage output from the 81c, the constant current power supply 27 reduces or stops the direct current, thereby preventing arc continuation. .

  Further, since the arc is detected only by the voltage output from the abnormality detection terminal 81c, the light emitting module 81 can be easily connected to an external device.

  Furthermore, by making the light emitting module 81 incorporating the detection unit 90 a detachable unit with respect to the constant current power supply 27, even when the light emitting module 81 is damaged, it is only necessary to replace each light emitting module 81. , Maintenance is also improved.

  In each of the above embodiments, a light source other than the LEDs 17 and 82 can be used as each light source.

11 LED lighting device as lighting device
17, 82 LED as light source
19 DC voltage circuit
25, 34, 38, 39, 60, 75 Control unit
26 Power supply
27 Constant current power supply
29 Constant current circuit that is a DC circuit
81 Light emitting module
90 detector

Claims (6)

A direct current circuit that outputs direct current to a connected light source;
A controller that detects an arc and reduces or stops the direct current when the arc is detected;
A power supply device comprising: The DC circuit is a constant current circuit,
The power supply apparatus according to claim 1, wherein the control unit detects an arc by an increase in an output voltage of the constant current circuit. The DC circuit is a constant voltage circuit,
The power supply apparatus according to claim 1, wherein the control unit detects an arc by reducing a direct current output from the constant voltage circuit. A power supply device according to any one of claims 1 to 3;
A light source that emits light when supplied with a direct current from a constant current circuit of a power supply device;
A lighting device characterized by comprising: A power supply device according to any one of claims 1 to 4;
A light source that emits light by being supplied with a direct current from a constant current circuit of a power supply device;
A light emitting module detachable from the power supply;
A lighting device characterized by comprising: A light emitting module including a light source and a detection unit that detects an arc based on fluctuations in the voltage of the light source and outputs a signal in accordance with the detection;
A constant current power source to which a light emitting module can be connected and which supplies a constant output current and varies the output current according to the signal output from the detection unit;
A lighting device characterized by comprising:

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